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Metal Doping Regulates Electrocatalysts Restructuring During Oxygen Evolution Reaction

Journal Article · · ChemSusChem
 [1];  [2];  [3];  [4];  [2];  [2];  [2];  [4];  [2];  [4];  [3];  [2]
  1. Oregon State Univ., Corvallis, OR (United States); Argonne National Laboratory (ANL), Argonne, IL (United States)
  2. Oregon State Univ., Corvallis, OR (United States)
  3. Univ. of Louisiana, Lafayette, LA (United States)
  4. Argonne National Laboratory (ANL), Argonne, IL (United States)

High-efficiency and low-cost catalysts for oxygen evolution reaction (OER) are critical for electrochemical water splitting to generate hydrogen, which is a clean fuel for sustainable energy conversion and storage. Among the emerging OER catalysts, transition metal dichalcogenides have exhibited superior activity compared to commercial standards such as RuO2, but inferior stability due to uncontrolled restructuring with OER. Here, in this study, we create bimetallic sulfide catalysts by adapting the atomic ratio of Ni and Co in CoxNi1-xSy electrocatalysts to investigate the intricate restructuring processes. Surface-sensitive X-ray photoelectron spectroscopy and bulk-sensitive X-ray absorption spectroscopy confirmed the favorable restructuring of transition metal sulfide material following OER processes. Our results indicate that a small amount of Ni substitution can reshape the Co local electronic structure, which regulates the restructuring process to optimize the balance between OER activity and stability. This work represents a significant advancement in the development of efficient and noble metal-free OER electrocatalysts through a doping-regulated restructuring approach.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Energy Efficiency and Renewable Energy (EERE); National Science Foundation (NSF); Oregon State University
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
2565580
Journal Information:
ChemSusChem, Journal Name: ChemSusChem Journal Issue: 18 Vol. 17; ISSN 1864-5631
Publisher:
ChemPubSoc EuropeCopyright Statement
Country of Publication:
United States
Language:
English

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